MIC4574-3.3YN

Voltage Regulators - DC DC Switching Regulators Overview

The MIC4574-3.3YN is a fixed-output step-down (buck) switch-mode voltage regulator manufactured by Microchip Technology. It operates at a switching frequency of 200kHz and provides a guaranteed 0.5A output current. The device accepts an input voltage range of 4V to 24V and delivers a fixed 3.3V output with ±3% accuracy under specified line and load conditions. Packaged in an 8-pin PDIP, it features internal cycle-by-cycle current limiting and thermal shutdown protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Fixed 200kHz switching frequency for simplified external component selection
• Integrated thermal shutdown and cycle-by-cycle current limiting for fault protection
• Low standby current consumption in shutdown mode

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered portable equipment requiring efficient voltage conversion
• General-purpose power supplies utilizing standard series inductors
• Embedded systems needing regulated 3.3V logic supply from higher voltage rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix '3.3' confirms the fixed 3.3V output variant rather than adjustable or other fixed voltages. Confirm the 'YN' designation corresponds to the PDIP-8 through-hole package. Ensure compliance with RoHS directives if required for the target application environment. Cross-reference datasheet revision history for any updates to electrical characteristics or pinout configurations.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required without external feedback resistors. It is suitable for designs prioritizing simplicity over adjustable output flexibility. Consider the 200kHz frequency for balancing efficiency and passive component size. Ensure the load current does not exceed the 0.5A limit and that input voltages remain within the 4V to 24V range.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the MIC4574 series of BiCMOS step-down regulators. It serves as a simpler alternative to older architectures like the LM2574, offering reduced external component counts. The series includes fixed 3.3V, 5V, and adjustable output versions, all sharing similar protection features and operating principles within the same package family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• MIC4574-5.0YN
• MIC4574YN

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current capability of the MIC4574-3.3YN?

The regulator guarantees a maximum switch current of 0.5A.

Does the MIC4574-3.3YN require external feedback resistors?

No, as a fixed-output version, it does not require external feedback resistors for voltage setting.

What protection features are included in the MIC4574-3.3YN?

It includes cycle-by-cycle current limiting and thermal shutdown protection.